Pump



Aug., 11, 1931. w, E. smvgNsoN PUMP Filed May 18, 1929 NM use .QN un mw.

S11/vanto@ WES Patented Aug. 11, 1931 FFME WILLIAM E. STEVENSON, OF PITTSBURGH, PENNSYLVANIA PUMP Application led Mey 18,

rlhis invention relates to the class of motors and pertains particularly to a motor of new and novel design to be operated by compressed air.

The primary object of the present invention is to provide a motor to be operated by compressed air or other fluid wherein the piston and valve element constitute the saine structure.

Another object of the invention is to provide a motor designed to be operated by a compressed fluid in which the pressure of the fluid against a piston will be automatically exhausted through the piston after the same has travelled to a predetermined position. v

Still another object of the invention is to provide a motor which may be reversely operated for the performance of pumping operations.

rlhe invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part of the present invention with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawings but may be changed or modified so long as such changes or modiications mark no material departure from the salient features of the invention as eX- pressed in the appended claims.

In the drawings Figure 1 is a central longitudinal view through the motor embodying the present invention.

Figure 2 is a sectional View taken upon the line 2-2 of Figure 1.

Figure 3 is a longitudinal sectional view through a modified form of the motor structure.

Figure 4 is a longitudinal. section of a conventional check valve 31 which is adapt- .ed for use in connection with this device to 45' be placed in passage 8.

Referring to the drawings in detail wherein like numerals of reference indicate corresponding parts throughout the several views, the numeral 1 indicates a horizontally mounted cylinder each end of which is 1929. Serial No. 364,076.

opened and interiorly threaded as at 2, tlniough the wall of' which a lateral port 3 opens through an interior-ly threaded collar l. A suitable base is provided for supporting the cylinder in proper position.

ln one end of the cylinder there is threadably secured a reducing coupling 6 in which coupling is threadably mounted a nipple 7 through the central portion of which is formed a passage 8, the outer end of this passage being enlarged and threaded as indicated at 9. The nipple 7 is designed to have connected, in the enlarged end of the passage therethrough, a suitable compressed air pipe (not shown) for the injection of the operating fluid into the motor.

A t its inner end there is extended from the nipple a cylinder 10 which terminates in the central part of the main cylinder body 1, as shown. This inner cylinder 10 is provided with one or more packing rings 11 about the outer face thereof for the purpose hereinafter more fully described.

In the other end of the main cylinder 1 is removably positioned a reducing coupling 12 and secured in this coupling is a piston rod guide nipple 13, the outer end of which is provided with a head lll through the centrai portion of which a passage 15 is formed.

Slidably extended through the passage 15 of the nipple 13 is a piston rod 16, the inner end of which carries a cylindrical piston body 17, the forward end of which is open, as shown, to receive the inner cylinder, in the manner shown.

The wall of the piston 17 is provided with a pair of vertically extending ports 1S which under normal conditions are closed by the cylinder 10, the piston being normally urged forwardly upon the cylinder 10 by a coiled spring 19 which surrounds the piston rod within the pump, one end of this spring bearing against the rear end of the piston while the other end bears against the nipple 123 through which the piston rod extends.

As is clearly shown in Figure 1, the packing ring 11 carried by the cylinderlO bears against the inner wall of the piston 17, thus preventing the escape of air between the contacting faces of the piston and the cylinder l0.

In the operation of this motor air or other suitable f'luid under pressure injected through the pasasge S against the inner end of the piston 1T forcing the piston and piston rod oll`l ot the cylinder' l() against the tension ot the spring 19. soon as the ports 1S reach the end of the cylinder l0, they will, ot course, be opened and the pressure of the fluid acting' upon the piston will be exhausted therethrough to escape through the port The spring` 19 Will. then act to return the piston to its former position, closing the ports 1S, after which the com pressed Huid uill again act in the manner previously described. This action will be repeated as lone` the compressed fluid is injected'into tne mot-or through the passage S.

The outer end ot the lusten rod le is provided with a suitable means tor coupling it with a crank or other mechanism, this means being' adjustable lengtlnvise ot' the piston rod as infflicated at SEU.

It will be readily seen that the operation above described may be reverseil tor the eniployn'ient o" the motor as a pump in which case the iiuid will be introduced through the port iii and as the piston rod lr6 is reciprocated the llnid Will enter the cylinder' piston through the ports i8 as the same are uncovered and will be trapped therein upon the forward movement elI the piston and escape through the passage S.

In Figure 3, a modilied form ot the strueture shown in Figure l is illustrated, showing the manner in ".vhich the structure oi the pump by a slight modification may be einployed as an exhaust valve. In this modification the cylinder' which will here be indicated as a n'hole by the numeral ll has the lateral port open tor use as au exhaust port as described in connection with the pump structure and has one end closed by a plug Q3. In the opposite end ot the cy inder may be engaged one end ot a pipe fl', the inner end of which reduced as at Q5, this reduced end being` positioned Within the cylinder, as shown,

Positioned over the reduced end of the pipe 24 is a cap 2G, through the skirt portion Q7 of u'hicn is formed a plurality, preterably four, of outlet ports QS. These ports are normally closed by the wall ot the reduced portion 25S and the cap is nornmllj,7 held tightly over the inner end ot' the pipe Q4 by a coiled spring 29, one end ot which bears againstthe plug` Q3 While 'the other end receives a post or pin carried by the bead ot the cap Q6 and bears against this fizzad in the manner shown.

It Will thus be seen that the principle oi the pump structure described and shovvn in Figure l may be employed to prm'ide an exhaust valve Which is normally closed and is actuated by the pressure of tluid passing through the pipe 24 and striking the cap 26 to force thesauie treni position en the r i n duced portion of the pipe until the ports 2S thereof are opened to permit the fluid pressure to be dissipated, following which, the spring 29 Will act to close the end of the pipe by returning the cap 26 to the position shown.

Having` thus described my invention, what I claim is l. A device of the character described, comprising a casing, a cylinder mounted u'ithin the casing and having,` the inner end thereof open, an apertnred sleeve slidably engiagin` said cylinder, said sleeve having one end thereof closed, a rod secured to the closed end of the sleeve, means for holding said rod concentrically of said cylinder, and a spring` loosely positioned about said rod and engaging the closed end of said sleeve whereby to constantly urge said sleeve in one direction.

Q. A device of the character described. comprising a casing, a cylinder mounted Within the using` and havingr the inner end thereof open, an ailiertured sleeve slidably menging the cyliruler, a packing member carried by the cylinder and engagingV the sleeve, and tensioned resilient means mounted within the casing and engaging the inner end of the sleeve for constantly urging the sleeve in one direction.

In testimony whereof I hereunto aliix my signature.

IVILLIAM E. STEVENSON. 

